Originally Posted by dmukina
Mobile 1 every 3 to 4 thousand miles. I just changed it about 15000 ago. It always comes out a little darker.

HAHAHAHA, lol! nice catch jake, i ment 1,500 miles ago!

 

LOL, yea that's what I figured you meant.

Guess I just have too much free time on my hands. Gotta Get a Life, LOL

Jake

 

Just wondering what you plan on doing with the old LT1?

if you are looking to get rid of the long block, email me at gtsviper2000@sbcglobal.net

 

Why not pull your engine & rebuild bottom end & have heads ported by Lloyd elliott?You could go with a 355 or 383 & have a new engine with alot more power than an Lt-4!Probley would cost the same.Why have 330hp instead of +450hp?Thats what I would do & have intake ported by Lloyd & have intake painted red so it looks like an Lt-4.The Lt-4 is bad *** but your this far so why not get some power!I would go the Lt-4 route if a rod went through your block & this engine was completely junk because of that.You have a perfect chance to build a bad-*** motor so why not-skip the Lt-4 & rebuild,port,paint,then tune

 

Sipmle answer to your question. DAILY DRIVER! Right now im in a rental car, so each day is costing me money. What i will end up doing is keeping my LT1 block and stroking it to a 383 (On my time) while picking my internals carefully. Then i will port the LT4 heads and intake mani and drop in a beautiful 383 stroker! I really want to take my time on building the 383 in my garage.

 

Sounds expensive(Lt-4 & then 383 build)Why not kill two birds with one stone & check out Golan engines.They have an extensive history with building Lt-1/4s.For the same price you can have a 450+ hp engine with a warranty!They probley have an engine you want ready to ship & make take your engine in as a trade-in or you can sell it here to offset some of the costs.Why do the job twice when you can do it once with an engine with a warranty,get the HP you want ready to bolt-in.Their engines are bolt-in.Also good luck getting a warranty on an engine you build.This is my opinion & let us know what you decideIs there a warranty on the Lt-4 that you are thinking about?Do some research on Golan Lt-1s are their specialty & I do not work for them

 

Another factor is that sometimes, like when buying a home or even, in many cases a new car, it's necessary to spread the cost over a longer period of time. Going that route may be best even though the total, end cost will be higher.

Considering the way our economy is now, some may not be in a financial position to foot the bill for a complete (or even 3/4) engine. So doing it in stages would be best. Individual cases vary.

Jake

 

I was trying to keep mine as my daily driver.

My tuner kept asking me when I was going to get something else to drive

I've got a truck now, and every time it snows I'm glad I did

 

Your right.But if he does have the funds now is the time.Also he could send the heads & intake in to get ported,replace the cam & have alot more power than the Lt-4 option & it would be cheaper-basically the head gasket job he was doing anyway plus replacing the cam

 

UPDATE, UPDATE, LOTS OF PICS!!!!!!! PAGE ONE! I mad my decision and i dont care if you like it or not! Went with the LT4 its been a work in progress, running into snags here and their.

 

You can't go wrong with an Lt-4 but all I was trying to say is why not spend the same money for more power.This is just my opinion.Hope everything works out for you & where are the pics?

 

go to page one!

 

I just thought of something - don't know if its an issue.

The 92 LT1 is a "batch" fire, all the injectors on one side fire at the same time.
IIRC the LT4 is a "sequential" fire, which means the injector for the cylinder in which the intake valve is opening is the only one that fires.

Like I said I don't know if it is an issue and maybe you already thought of it.

 

Are you absolutely sure it's an LT4? From the photo you posted I now have my doubts.

Did anyone else notice it too?

Jake

 

Here is a little information on the topic.

From Thread
http://forums.corvetteforum.com/c4-t...bank-fire.html
member engle1147
Basic Types of Injection
Throttle Body Injection (TBI): the fuel injectors are located at the throttle body (1984 cross fire setup)
Single Port Fuel Injection (SPFI) simply implies that a fuel injector is located within the intake port very close to the valve location (L98, LT1, LT4 & LT5) Port Fuel Injection systems on a C4 Corvettes can also be Batch, Bank or Sequential Firing injector setups.

Batch/Bank Fire Injection includes TBI, TPI & early LT1s (1984 TBI, 1985-1991 L98 & 1990-1992 LT1)

In a batch fire setup the injector pulse signal is actuated by the ignition reference pulses. All 8 injectors are energized at the same time, once per engine revolution. Because and engine makes 2 revolutions per combustion cycle, each port gets 2 injections of fuel during each cycle. With a batch fire computer all 8 of the injectors are fired simultaneously once for each crank rotation.

In a bank fire setup there are a minimum of 2 contollers; one for each bank. Instead of one firing of all 8 injectors are two firings of 4 and 4 (odd 1357 and even 2468) injectors. One firing occurs one after the other. Same as mentioned above, the both batches in each bank are fired once per engine revolution. Because and engine makes 2 revolutions per combustion cycle, each port gets 2 injections of fuel during each cycle. With a bank fire computer all 8 of the injectors are fired one time for each crank rotation.



Timed Sequential Firing Injection (SFI) (1990-1995 ZR1 1994 & up LTX motors)

Injectors are controlled to deliver fuel just before the inlet valve for each cylinder opens sequentially (one after another) and each injector requires its own controller. The delivery control on an SFI system is done using a camshaft position sensor and or crank/ignition reference pulses. The introduction of SFI in the 1994 LT1 is done at the PCM prom logic level.

Conclusion
Cross referencing reputable informaton I've read it seems that the 1984-1987 & 1990-1993 C4's are all bank fire and only 1988-1989 are batch fire....since they appear to have only one injector contoller for both banks.The LT1 was introduced in 1992 but was bank fire unitl 1994 when the sequential fire system was used.

Confusion
In regards to this link:http://members.shaw.ca/corvette86/En...agram%2086.pdf
The diagram is a simplified diagram for illustration purposes only...wire diagrams that are accurate you'll need to look in section 8A...if you flip to section 6E in most other early FSM books you'll see the same misleading diagram.

References:
1984-1996 GM FSMs
GM STG injector service manual (Service Technology Group)16009.10-3
Corvette Tech Q&A 1953- Present by Dave Emanuel
http://www.fuelinjection.com/portinj.html
http://www.speedscenewiring.com/fuelinjection.html

This is a quote from GMHP magazine
"Most early EFI systems were batch-fire systems where the ECM fired all eight injectors simultaneously. Usually batch-fire systems fire the injectors once per engine revolution. This way, the injectors could be sized small enough to be more easily controlled at idle. Later, sequential EFI systems were refined to fire an injector a few degrees before the intake valve opened. Generally, sequential injection offers more precise fuel control at the price of increased complexity. But on production engines, the benefits are more in the area of emissions and driveability than in performance"

- From what i have gathered, regardless of Batch, Bank, or Sequential the injectors always fire before the intake valve opens. That being said, i really dont think (thinking out loud here) that their can be a large enough difference for me to worry about any thing.

 

What I'm seeing on the engine with the red intake manifold is an EGR valve. LT4s don't have EGR. So either that's:

A LT4 intake that has had a EGR valve installed or,

A LT1 intake installed on a LT4 engine or

A LT1 engine

You might want to pull a valve cover to make sure what you have. A LT4 should have roller rockers and the head casting number should tell the tale.

Jake

 

Awesome job on the picsI will do the same when I get some ($) for Lloyd elliott package unless he is running an amazing deal right now.Did you add on the EGR to your Lt-4?If you did was the Lt-4 designed to be running a EGR without hurting anything?

 

I'm guessing #1 or #3. Maybe the OP will tell us he put back on the EGR from his original 92 so he wouldn't get the pesky SES light?

IIRC because of the cam overlap the LT4 didn't need the egr.

 

Could be.

Jake

 

Yes! I took the EGR off of my 1992 LT-1 and placed it on the LT-4 Intake Mani. MAN, YOU GUYS DON'T MISS ANYTHING, LOL.